Ergonomic trackball



FIG. 1 is a front, elevated, left side perspective view of the ergonomic trackball showing our new design;

FIG. 2 is a rear, elevated, right side perspective view of the ergonomic trackball of FIG. 1;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear elevational view thereof; and,

FIG. 8 is a front elevational view thereof. 

The ornamental design for an ergonomic trackball, as shown. 